38 lines
1.3 KiB
Python
38 lines
1.3 KiB
Python
from __future__ import annotations
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from collections.abc import Awaitable, Callable, Iterator
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from typing import Any, ParamSpec, Protocol
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P = ParamSpec("P")
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_Scope = Any
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_Receive = Callable[[], Awaitable[Any]]
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_Send = Callable[[Any], Awaitable[None]]
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# Since `starlette.types.ASGIApp` type differs from `ASGIApplication` from `asgiref`
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# we need to define a more permissive version of ASGIApp that doesn't cause type errors.
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_ASGIApp = Callable[[_Scope, _Receive, _Send], Awaitable[None]]
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class _MiddlewareFactory(Protocol[P]):
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def __call__(self, app: _ASGIApp, /, *args: P.args, **kwargs: P.kwargs) -> _ASGIApp: ... # pragma: no cover
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class Middleware:
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def __init__(self, cls: _MiddlewareFactory[P], *args: P.args, **kwargs: P.kwargs) -> None:
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self.cls = cls
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self.args = args
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self.kwargs = kwargs
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def __iter__(self) -> Iterator[Any]:
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as_tuple = (self.cls, self.args, self.kwargs)
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return iter(as_tuple)
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def __repr__(self) -> str:
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class_name = self.__class__.__name__
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args_strings = [f"{value!r}" for value in self.args]
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option_strings = [f"{key}={value!r}" for key, value in self.kwargs.items()]
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name = getattr(self.cls, "__name__", "")
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args_repr = ", ".join([name] + args_strings + option_strings)
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return f"{class_name}({args_repr})"
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